1 Answer
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As indicated here, domain registrations for the .ni ccTLD are at the third level (e.g., domain.co.ni or domain.com.ni).

Apart from those at the second level that are reserved for third-level extensions (like above), and those reserved for state organizations like the registry itself (nic.ni), the remaining second-level domains may have been released during a preregistration period, auction, or possibly just on a first-come, first-choice basis...

In any case, second-level .ni domains aren't available for registration, as indicated at nic.ni which requires a third-level extension. Also registrars such as gandi.net state:

Warning the .NI is available only in third-level domainsYou can register the following at Gandi .COM.NI, .NET.NI, .ORG.NI, .NOM.NI